one specific diffidence is the natural distortion of the paradise...in the lower frequencies it has the most, and as frequency gets higher distortion gets lower.. but Iam not too sure that what you say is valid... Sound-staging has also at lot to do with speakers and environment and the two phono-stages moved here may produce totally different results. here my sound-stage changes if I change polarity of my main cables...Try changing it on your paradise and you may get a chock..

also the foundation for your boxes need to be good.. try some decoupling like the NO-sort-kones...if you place it on rubber feet, all gets swamped and the sound gets flat and narrow..

Point is that a lot has influence on the sound and sound-stage.. not only the circuit.

An impression of a bigger soundstage can also come when the system has some crosstalk.
That is counter intuitive but you may remember sound processors from the 70th that did exactly that. This is because the left speaker idles into the right ear and the other way around so bleeding some signal from one channel into the other makes the soundstage wider, that is often done in headphone amps. See many circuits at the Headwize forum.
That is one reason i put my speakers wide apart and sit close.

Yes, Ricardo, that is true. The first time i heard that not only the value of the loading resistor makes a difference but also the type was from Prof. Hawkford at the end of the 80th. When they made the Essex Equalizer, that was maybe one of the first transimpedance phono stages, they found that when they put the needle into the lead in grove that the NOISE sounded different. He claimed that he got so good he could identify the type of resistor just by listening to the grove noise. They decided on a Shinko tantalum
in the end. I use Dale RS65. Soory to repeat me, but this has also an influence on the soundstage. The ear is very good at analyzing noise.